CVE-2025-62221 Microsoft Windows Use After Free
An authorized local attacker can exploit a use-after-free flaw in the Windows Cloud Files Mini Filter Driver to elevate privileges.
- Exploited in the wild
- Since 9 Dec 2025
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-62221?
CVE-2025-62221 is a high-severity use after free vulnerability in Microsoft Windows 10 1809, published on 9 Dec 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Use after free in Windows Cloud Files Mini Filter Driver allows an authorized attacker to elevate privileges locally.
Weakness: CWE-416
Which versions are affected by CVE-2025-62221?
It affects 10 products.
Products include Microsoft Windows 10 1809, Microsoft Windows 10 21h2, Microsoft Windows 10 22h2, Microsoft Windows 11 23h2, Microsoft Windows 11 24h2, Microsoft Windows 11 25h2 and 4 more.
How do I fix CVE-2025-62221?
No fix has been published for CVE-2025-62221 yet. Limit exposure of the affected software until one is available. US federal agencies must fix it by 30 Dec 2025.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2025-62221 being exploited?
Yes. Attackers have exploited CVE-2025-62221 in the wild since at least 9 Dec 2025.
Public exploit code: 1 proofs of concept on GitHub.
Other vulnerabilities in Microsoft Windows 10 1809
- CVE-2024-29988 Microsoft SmartScreen Prompt Security Feature Bypass
- CVE-2024-21412 Microsoft Windows Internet Shortcut Files Security Feature Bypass
- CVE-2025-30400 Microsoft Windows DWM Core Library Use-After-Free
- CVE-2024-21338 Microsoft Windows Kernel Exposed IOCTL with Insufficient Access Control
- CVE-2023-36033 Microsoft Windows Desktop Window Manager (DWM) Core Library Privilege Escalation
Sources
Also known as GHSA-4xhr-vh2p-rpch.